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Monday, August 06, 2012

Current Source and Voltage Source

Current Source:

----A current source is an electrical or electronic
device that delivers or absorbs electric current. A current source is the dual of a voltage source. The term constant-current sink is sometimes used for sources
fed from a negative voltage supply.

----If the current through an ideal current source can be
specified independently of any other variable in a circuit, it is called an independent
current source. Conversely, if the current through an ideal current source is
determined by some other voltage or current in a circuit, it is called adependent
or controlled current source.

----The internal resistance of an ideal current source
is infinite. An independent current source with zero current is identical to an
ideal open circuit. The voltage across an ideal current source is completely
determined by the circuit it is connected to. When connected to a short circuit,there is zero voltage and thus zero power delivered.

Voltage Source:

----An ideal
voltage source or constant voltage (CV) source is a circuit element
where the voltage across it is independent of the current through it. A voltage
source is the dual of a current source. In analysis, a voltage source supplies a constant DC or AC
potential between its terminals for any current flow through it

----If the voltage across an ideal voltage source can be
specified independently of any other variable in a circuit, it is called an independentvoltage source. Conversely, if the voltage across an ideal voltage source is
determined by some other voltage or current in a circuit, it is called a dependent
or controlled voltage source.

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